Minutes 18 october 2012

###identifying use-cases

• identified attributes for Study(/StudyGroup) from the open issues list
• new properties and use-case descriptions are documented in the google doc
• by agency: "Find data published by a specific organization"

• identified differences between dct:creator, dct:publisher, distributor, producer
• added one more use-case motivated by the distinction of the terms

• "by agency" became "by publishing agency", e.g. "Find data published by a specific organization"
• added "by creator/contributor", e.g. "Find data attributed to a specific researcher"

• by study: "Find study by free text search in title or abstract, kind of data, or unit of analysis, …"

• skipped "versioning" and "dct:provenence" to model it properly in future
• added attribute "dct:available": people want to know what the publication date is, or when the study will be available
• added attribute "dct:purpose": paragraph that states why the study was conducted
• added attributes "dct:subject", "dct:title", "subtitle" and "dct:alternative" functioning as the alternative title
• added attribute "kindOfData" and "analysisUnit" according to the DDI model

• identified "dct:Dataset" to be a superclass of our "disco:DataFile"
• discussion: difference between universe and coverage

• universe: is the population that you've studied, e.g. "children born in one week in 1970 in UK"
• coverage: application to the datafile in terms of topic; study level thing
• group agrees to have that distinction and that it is modelled correclty

• by coverage: "Find data which was collected on a specific part of population or geographic location"

• added to Coverage "dct:spatial", "dct:temporal", "dct:subject"
• discussion: is Universe actually a skos:Concept?

• yes.

• added to Universe "skos:broader/narrower"

• by instrument: "Find data collected by a specific “device” (e.g., survey)"

• added "rdfs:label", "rdfs:comment", "externalDocument", i.e. URL, that points to the documentation

• by variables: "Find datasets by searching the properties of variables, e.g., their associated concepts and data elements, representation, description and analysis unit"

• introduced element "AnalysisUnit" being a subclass of "skos:Concept"; since "analysisUnit" as an property is used in various places

• relationship to Study
• relationship to Variable

• by concepts: "Find variables of a specific topic (e.g. education)"
• by questions: "Find all variables which are populated by specific questions (description)."

• added "collectionMode" to Questionnaire, according to DDI. values are blank nodes or "skos:Concept"
• Study - Instrument: cardinality might have to be changed if we want to have reusable instruments in the future

• by concepts (Questions): .. missing ..
• by variables (Questions): "Find questions (name, labels) and their response categories which are using a specific variable (e.g. age)"
• by question text: "Find questions by searching on the question text or name"
• by universe/coverage (Questions): "Find questions by searching on the related coverage in the universe links of studies"

###Further Design Issues

• Datatype Properties

• citation (Instrument): dropped it, since it is not used in this context
• name (Universe): added
• citation (LogicalDataSet): discussion: do we need this?

• added "disco:ddiFile" attribute to Study pointing to foaf:Document. Represents a human-readable form
• citation is not introduced in LogicalDataSet

• checked the other datatype properties and erased unused

###Summurization/Conclusion

• We have walked through all of the open issues identified at the last meeting
• the most important issues were

• the ontology base url and prefix
• checking consistency, basically the naming conventions and cardinalities
• building up use-cases

• we than started to walk through all datatypeProperties and objectProperties which were left for discussion after the last meeting
• identified a small set of use-cases and tried to find these in the model; some properties were added and removed respectively.
• updated the turtle file along with modifications on the model